There is a predominance of evidence that medical face masks protect both the wearer and persons near the wearer from the spreading of viruses.
The wearing method is as follows:
(1) Wash your hands before wearing the mask, and avoid touching the inner side of the mask with your hands during the process of wearing the mask to reduce the possibility of contamination of the mask;
(2) When wearing, distinguish the inside, outside, top and bottom of the mask. The light-colored side is inside and the dark side is facing out. One end of the metal strip (nose clip) is above the mask, and the folded surface is fully unfolded;
(3) Put the side with the nose clip up, wrap the mouth, nose, and lower jaw, adjust the lower end of the mask to the proper position of the lower jaw, hang the elastic bands on both sides of the ears or tie the straps at both ends to the back of the head, and then squeeze the nose clip to make the mask fit the face completely.
Technical reference | Parameter requirements | ||
The technical standards | YY 0469-2011 Medical Shell Masks | ||
Size | Length: 17cm, width: 9.4cm | ||
Appearance quality | Clean and in good shape No damage or stains | ||
Sterilization | Sterilization | ||
The technical standards | The test items (Unit of measurement) | Range of tolerances | Conclude |
Bacterial filtration efficiency (BFE) | ≥ 95% | Qualified | |
Particle Filtration Efficiency (PFE) | ≥ 30% | Qualified | |
Pressure difference | ≤49Pa | Qualified | |
Flame retardancy | ≤5S | Qualified | |
Delayed type hypersensitivity | No anaphylaxis | Qualified |